What is a servo press?

A servo press uses servo motors for precise force and position control during forming operations.

How do I calculate servo press tonnage?

Use our free tonnage calculator at servopress.club/tonnage-calculator.html

Servo Press Oil Analysis: What the Results Mean and When to Act

admin

Oil analysis is the most cost-effective diagnostic tool for servo press gear systems. A 30 USD oil sample can prevent a 50,000 USD gearbox failure. Here is how to interpret the results.

## What to Test For

Send samples to a lab that reports:
- Viscosity at 40C and 100C
- Water content (Karl Fischer method)
- Particle count (ISO 4406 cleanliness code)
- Wear metals: iron (Fe), copper (Cu), aluminum (Al), chromium (Cr)
- Additive metals: zinc (Zn), phosphorus (P), calcium (Ca)

## Interpreting Viscosity Results

Compare to the new oil specification. Acceptable range: within 10% of nominal.
- Viscosity too low: oil is thinning due to contamination or thermal degradation. Change oil.
- Viscosity too high: oil is thickening due to oxidation. Change oil.

## Interpreting Water Content

Target: under 0.05% water.
- 0.05-0.1%: investigate source, increase monitoring frequency
- Over 0.1%: change oil immediately, find and fix the water source

Water in gear oil causes hydrogen embrittlement of bearing surfaces and accelerates fatigue failure.

## Interpreting Wear Metals

Iron (Fe): comes from gears and bearing races. Baseline for a healthy system: under 50 ppm. Rising trend indicates gear or bearing wear.

Copper (Cu): comes from bronze bushings and thrust washers. Baseline: under 20 ppm. Rising trend indicates bushing wear.

Chromium (Cr): comes from bearing races. Any significant chromium (over 5 ppm) is a warning sign.

## Action Levels

Normal: all metals within baseline, viscosity within spec, water under 0.05%
Monitor: any single parameter 2x baseline, increase sampling to monthly
Investigate: any parameter 3x baseline or rapid increase between samples
Act immediately: water over 0.1%, viscosity out of spec, any metal over 5x baseline

## Sampling Procedure

Sample from the same location every time (drain plug or dedicated sampling valve). Sample when the oil is at operating temperature. Use clean sampling equipment. Label with machine ID, date, and oil hours since last change.

raj_maintenance

We've been doing quarterly oil analysis for 5 years. The trending data is gold. Last year we caught increasing iron particle counts on our 300T press —went from 15 ppm to 45 ppm over 6 months. Turned out to be a main bearing starting to spall. Scheduled replacement during a planned shutdown instead of an emergency repair. Saved us at least $50K in unplanned downtime.

jim_applications

Water contamination is the one to watch in humid climates. Anything above 200 ppm water in gear oil accelerates bearing wear dramatically. If your oil analysis shows high water, check the breather cap seal and consider a desiccant breather. They cost $50 and keep moisture out of the gearbox.